Paper-making machine



mea'sgss. Patented Oct. I7, I899.

F; J. MARSHALL.

PAPER MAKING MACHINE. (Application filed Nov. 17, 1898. (No Model.)

UNITED STATES PATENT Urnrcn.

FRANK J. MARSHALL, OF TURNERS FALLS, MASSACHUSETTS.

PAPER-MAKING IVIACHINE.

SPECIFICATION forming part of Letters Patent No. 63 5,266, dated October 17, 1899.

Application filed November 17,1898. Serial No. 696,665. (No model.)

To (LZZ whom it may concern:

. Be it known that I, FRANK J. MARSHALL, of Turners Falls, in the county of Franklin and State of Massachusetts, have invented a new Improvement in Paper-Making Machines; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, a broken view of apaper-making machine embodying my invention; Fig. 2, a sectional view of the endless pulp-receiving web; Fig. 3, a sectional View of the endless supporting-web;

My invention relates to an improvement in paper-making machines'of the Fourdrinier type, which, as is well known, employ endless webs or aprons of wire-cloth, on which the pulp is floated.

In the manufacture of very thin papers, such as cigarette-papers, on machines of this type wire-cloth webs of extremely fine mesh are employed. These webs, being made of very fine wire, have less resistance to Weight and wear than webs fabricated from coarse wire. The result of this is that webs of very fine mesh wear and stretch and get out of shape and require such frequent renewal as to make the item of webs a very heavy one in maintaining the machines in working order.

The object of my invention is to reduce the expense of maintaining such machines in order by providing means for relieving the strain imposed upon the pulp-receiving webs.

With these ends in View my invention consists in the employment of a wire-supporting web which is arranged so as to virtually carry the endless pulp-receiving web when the same is sustaining a mass of paper-pulp, the sup= porting-Web being coextensive with the pulpreceiving web.

My invention further consists in providing tension devices by means of which the ten sion of the two webs may be regulated independently or together.

My invention further consists in certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

For the illustrationof my invention I have shown a section of a paper-making machine of the Fourdrinier type, enough of the machine being shown to illustrate the invention.

In carrying out the invention I employ a complete, continuous, or endless wire-s11 pporting web A, which is placed Within the complete, continuous, or endless pulp-receiving Web B, so as to virtually carry the same when the same is supporting a mass of paper-pulp, whereby the pulp-receiving web is largely relieved from weight and strain and prevented from wearing or sagging or otherwise getting out of operative condition. The supportingweb will be made of wire-cloth of coarsermesh than the wire-cloth employed for the pulp-receiving web, which under my invention may be made much finer in mesh than it would be practical to use without a wire-supporting web.

The devices-employed by me for taking up the slack in the two webs and for maintaining them under proper tension may of course Vary. As herein shown, I employ in conjunction with the supporting-web a drum 0, hung in a frame 0', which swings upon a stud C mounted-in a head 0 located at the lower end of a screw 0, passing through an arm 0 of a frame D, which is vertically adjustable upon a threaded post E. By shifting the nuts F andF upon the screw 0 the drum 0 may be raised or lowered, as desired, for changing the tension of the web B without disturbing the tension of the web A. For the adjustment of the tension of the web A, I employ a drum G, mounted in a frame G, swinging upon a stud G supported in the head G of a screw G mounted in an arm G offsetting from the upper end of the frame D. Nuts G and G are provided for raising and lowering the drum G independently ofthe drum 0. Both of the drums maybe simultaneously raised and lowered by raising or lowering the frame D by shifting the nuts D D upon the threaded post E, the upper end of which is entered into a socket I-I, formed at the lower end of a threaded bolt H, vertically adjustable in the upper portion of the frame of the machine.

In view of the modifications herein suggested'and of others which may apparently bemade, I would have it understood that I do not limit myself to the exact construction shown, but hold myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of my invention.

I am aware that it has been proposed to employ webs of wire-cloth to partially support the pulp-receiving web of a paper-making machine, and hence I do not broadly claim the support of a pulp-receiving Web by means of a supporting-web.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a paper-making machine, the combination with a pulp-receiving web upon which the paper-pulp is floated, of a wire-supporting web coextensive with the pulp-receiving web and coacting therewith to relieve the strain thereupon.

2. In a paper-making machine, the combination with a pulp-receiving web, of a wiresupporting Web coacting with the said pulpreceiving web with which it is coextensive, to relieve the strain thereupon, and means for adjusting the said webs in tension, independently and simultaneously.

3. In a paper-making machine, the combination with a pulp-receiving web and a wiresupporting web therefor, of means for adjusting the tension of the two webs independently or simultaneously, consisting of two independently-adjustable drums, a frame by which the drums are carried, and means for adjusting the said frame in position.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

FRANK J. MARSHALL. 

